What is a 'looping tool' used for in EarSketch?

A looping tool in EarSketch is primarily used to repeat sections of audio easily within a composition. This function allows users to create rhythms and patterns by looping a specific segment, enabling them to build a musical piece without needing to manually re-enter the same audio multiple times. This is particularly useful in music production where repetition of certain elements, such as a beat or melody, is often key to developing a cohesive track.

The other options, while related to audio manipulation, pertain to different functions. For instance, creating complex sound effects involves a different set of techniques and tools. Blending different audio files focuses on mixing various sounds rather than repeating them, and adjusting the tempo is more about changing the speed of the whole track rather than repeating specific sections. The looping tool specifically facilitates the repetition of chosen audio segments, making it essential for efficient composition in EarSketch.